diff options
Diffstat (limited to 'bgp/bgp-prefix-sid/src/main/java/io/fd/hc2vpp/bgp/prefix/sid/IpRouteRequestProducer.java')
| -rw-r--r-- | bgp/bgp-prefix-sid/src/main/java/io/fd/hc2vpp/bgp/prefix/sid/IpRouteRequestProducer.java | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/bgp/bgp-prefix-sid/src/main/java/io/fd/hc2vpp/bgp/prefix/sid/IpRouteRequestProducer.java b/bgp/bgp-prefix-sid/src/main/java/io/fd/hc2vpp/bgp/prefix/sid/IpRouteRequestProducer.java new file mode 100644 index 000000000..4093a040b --- /dev/null +++ b/bgp/bgp-prefix-sid/src/main/java/io/fd/hc2vpp/bgp/prefix/sid/IpRouteRequestProducer.java @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package io.fd.hc2vpp.bgp.prefix.sid; + +import static com.google.common.base.Preconditions.checkArgument; +import static io.fd.hc2vpp.bgp.prefix.sid.MplsRouteRequestProducer.MPLS_LABEL_INVALID; + +import io.fd.hc2vpp.common.translate.util.Ipv4Translator; +import io.fd.vpp.jvpp.core.dto.IpAddDelRoute; +import java.util.List; +import javax.annotation.Nonnull; +import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix; +import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address; +import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix; +import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.LabelStack; +import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.routes.list.LabeledUnicastRoute; +import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.CNextHop; +import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.c.next.hop.Ipv4NextHopCase; + +interface IpRouteRequestProducer { + /** + * Produces {@link IpAddDelRoute} request that imposes MPLS label received via BGP LU on packets + * destined to the prefix the label was assigned to. + * + * @param route BPG LU route received via BGP + * @param isAdd determines whether to produce request for adding or removing VPP config + * @return jVpp request for updating VPP IP FIB. + * @see <a href="https://tools.ietf.org/html/rfc3107">Carrying Label Information in BGP-4</a> + * @see <a href="https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07#page-10">BGP Prefix SID: programming + * outgoing label</a> + * @see <a href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-msdc-08#section-4.2.2">FIB example + * for SR in the DC usecase</a> + */ + default IpAddDelRoute ipAddDelRouteFor(@Nonnull final LabeledUnicastRoute route, final boolean isAdd) { + final IpAddDelRoute request = Impl.ipAddDelRoute(isAdd); + Impl.translate(route.getPrefix(), request); + Impl.translate(route.getAttributes().getCNextHop(), request); + Impl.translate(route.getLabelStack(), request); + return request; + } + + final class Impl { + private static IpAddDelRoute ipAddDelRoute(final boolean isAdd) { + final IpAddDelRoute request = new IpAddDelRoute(); + request.isAdd = Ipv4Translator.INSTANCE.booleanToByte(isAdd); + + // default values based on inspecting VPP's CLI and make test code + request.classifyTableIndex = -1; + request.nextHopWeight = 1; + request.nextHopViaLabel = MPLS_LABEL_INVALID; + return request; + } + + private static void translate(@Nonnull final IpPrefix prefix, final IpAddDelRoute request) { + // BGP Prefix SID for v6 is not supported + final Ipv4Prefix ipv4Prefix = prefix.getIpv4Prefix(); + checkArgument(ipv4Prefix != null, "Unsupported IpPrefix: %s, ipv4Prefix is missing.", prefix); + request.dstAddressLength = Ipv4Translator.INSTANCE.extractPrefix(ipv4Prefix); + request.dstAddress = Ipv4Translator.INSTANCE.ipv4AddressPrefixToArray(ipv4Prefix); + } + + private static void translate(@Nonnull final CNextHop nextHop, @Nonnull final IpAddDelRoute request) { + checkArgument(nextHop instanceof Ipv4NextHopCase, "only ipv4 next hop is supported, but was %s", nextHop); + + final Ipv4Address nextHopAddress = ((Ipv4NextHopCase) nextHop).getIpv4NextHop().getGlobal(); + request.nextHopAddress = Ipv4Translator.INSTANCE.ipv4AddressNoZoneToArray(nextHopAddress.getValue()); + + // We create recursive route. In order to make everything work, + // operator needs to manually map next hop address to proper interface. + // Either via CLI or HC. + // + // VPP can't recursively resolve a route that has out labels via a route that does not have out labels. + // Implicit null(3) label is trick to get around it (no more labels will be added to the package). + // CLI example: + // + // ip route add <next-hop-prefix> via <next-hop-ifc> out-labels 3 + request.nextHopSwIfIndex = -1; + } + + private static void translate(@Nonnull final List<LabelStack> labelStack, + @Nonnull final IpAddDelRoute request) { + // It is quite possible we could support multiple labels here, but it was never tested + // so it is not supported currently. + final int labelCount = labelStack.size(); + checkArgument(labelCount == 1, "Single label expected, but labelStack.size()==%s", labelCount); + final int label = labelStack.get(0).getLabelValue().getValue().intValue(); + + // TODO(HC2VPP-271): add support for special labels, e.g. implicit null (for PHP). + + // Push label received via BGP on packets destined to the prefix it was assigned to: + request.nextHopOutLabelStack = new int[] {label}; + request.nextHopNOutLabels = 1; + } + } +} |